Today is the last day to register to vote for the Nov. 4 general election, which features high-profile races including the U.S. presidency and Honolulu mayor.

All registration applications by mail must be postmarked no later than today. To register in person, you have until 4:30 p.m. today.

Early voting is from Oct. 21 to Nov. 1 at various locations.

Elections officials said voters who've changed addresses or names since the last election should re-register for this year's elections. First-time voters registering to vote by mail must provide proof of identification.

You can use either a copy of a current photo ID or a copy of a current utility bill, bank statement, government check, paycheck or government document that shows your name and address.

Any Hawai'i resident who is a U.S. citizen over 18 years old may register to vote. Currently registered voters who have changed their name or address since the last election should re-register.

Voter registration forms are available at post offices, libraries, the Office of Elections Web site, county clerks' offices and phone books.

Registration forms postmarked by today will be accepted, but elections officials are encouraging last-minute voters to turn in their papers in person to avoid the possibility of a mix-up.

Hawai'i had record low turnout of about 37 percent in its Sept. 20 primary election, but the Nov. 4 general election should generate more interest with Honolulu-born Democrat Barack Obama and Republican John McCain on the ballot for president.

The mayor's races in three counties will pit Honolulu Mayor Mufi Hannemann against Anne Kobayashi, attorney Billy Kenoi against Councilman Angel Pilago on the Big Island, and County Parks Director Bernard Carvalho Jr. against County Councilwoman JoAnn Yukimura on Kaua'i.

On O'ahu, voters also will get to vote on a rail question. The statewide ballot includes a question on a constitutional convention and there will be seven contested races in the state Senate, 27 contested races in the state House and other races to decide.

There are about 682,000 registered voters in Hawai'i, which reflects a steady increase in each election since 2004.

Turnout was about 53 percent in 2006 and 67 percent in 2004, when Republican President Bush won a second term against Democrat John Kerry.